Arrangement of wet presses on paper and board making machinery



June 23, 1931. 1,810,964

ARRANGEMENT OF WET PRESSES oN PAPER AND BOARD MAKING MACHINERY w. HELLER Filed Aug.- 10. 1929 INVENTOR f @175 Ana/Mr Patented June 23, 1931 UNITED STATES PATENT OFFICE wan'rnm HELLER, orHnmmnIM-oN-rHE-Bmz, GERMANY, Assmnon TO 3'. m. VOITH, OF HEDDENHEIM-ON-THE-IBRENZ, GERMANY, A CORPORATION OF GERMANY ARRANGEMENT OF WET PRESSES 0N PAPER AND BOARD MAKING MACHINERY Application filed August 10, 1929, Serial No. 384,919, and in Germany May 24, 1928.

This invention relates to arranging the wet presses for paper and board machines and its object is an improvement in the equipments for obtaining a more uniform glazing on both sides of the paperweb.

When dewaterin the paper web in the press part it has t0%)8 carried in view of the poor consistency on felts that permit the water to pass. If the paper web goes through the press rolls with its carrying medium the fabric of the felt just-as the structure of the wire at the couch press, is pressed into the soft and wet sheet of paper leaving these undesirable felt marks that have to be removed again by appropriate means. It is the general custom to turn about the paper for that purpose before passing the last wet press so as to have the previous upper surface of the paper on the felt and to receive the glazing action of the stone or chilled iron roll on the wire side of the paper. Such turning or top felt presses are rather complicated in their design and unfit for high speed paper making machines.

This invention is to obviate these inconveniences and drawbacks by reversing the arrangement of rolls in use so far, where the nonelastic glazing roll (mostly of stone or chilled iron) was on top, the elastic (mostly rubber) covered roll on bottom, by placing the latter on top and the hard glazing roll on bottom, thus coming in direct contactwith the paper so that the bottom side provided with wire and felt marks reposes directly on the hard and polished surface of the roll. Hence the paper is led by an upper felt in accordance with the invention while suppressing the bottom felt.

With thinner papers thisupper felt is conducted in'commonpthrough said press and the preceding one, butwith stronger papers it will sufiice to let the upper felt run only through the new press. In some particular cases it will do to replace the upper felt by a felt jacketmanchon-on the elastic roll running on top.

The transfer of the paper is preferably accomplished by compressed air.

Further details of the invention will be set forth in two typical arrangements diagrammatically shown in Figures 1 and 2.

Figure 1 illustrates an arrangement with one common upper felt for the new press and the preceding one.

Figure 2 shows the same arrangement for thei upper felt which runs through new press on y.

The paper web A being smooth on the upper surface and carryin wire and felt marks on its under side goes t rough a normal wet press B with top roll B of stone, chilled iron or other rigid polished material and bottom roll B covered with rubber or any other elastic means. Web A is carried by a bottom wet felt B In the new press 0 the top roll C is covered with an elastic stockin manchon, etc. whereas the bottom roll C consists of a non-elastic polished materialstone, chilled iron, etc. There will be no bottom felt. In the arrangement as per Fig. l the upper felt C passes both presses and in that of Fig. 2 itgoes through the new press only lying in front of the first drying cylinder D. Air is used for conveying the paper and it is directed against the paper web through nozzles E.

Claims:

1. In a wet press for paper making machines, horizontally spaced sets of press rolls between which the paper is adapted to be moved in substantially a horizontal plane,

the upper roll in one set and the lower-roll in the other set having a hard finished sur face whereby the opposite surfaces of the paper sheet are smoothly pressed without reversal thereof.

2. In a wet press for paper making machines, horizontally spaced sets of press rolls moved in substantially a horizontal plane, the upper roll in one set and the lower roll in the other set having a hard finished surface whereby the opposlte surfaces of the paper sheet are smoothly pressed without reversal thereof, and the other roll in each sethaving an elastic surface covering, a lower felt passing between the lower elastic covered roll in one set and the paper sheet, and an upperfelt passing between the upper elastic covered roll in the other set and the paper sheet.

4. In a wet press for paper making mae chines,

, between which the paper is adapted to be moved in substantially a horizontal plane, the upper roll in one set and the lower roll in the other set having a hardfinished surface whereby the opposite surfaces of the paper sheet are smoothly pressed without reversal thereof, and the other roll in each set having an elastic surface covering, a lower felt passing between the lower elastic covered roll in one set and the paper sheet, and an upper felt haying a part disposed in superimposed relation to the lower felt and extending between and through the spaced sets of press rolls.

In testimony whereof I afiixmy si ature.

WALTHER HEL ER.

horizontally spaced sets of press rolls 

